Compact Flanges

The Compact Flange System® is a fully proven alternative to the conventional
flanged connection used throughout the oil, gas, petrochemical and power generation
industries. Produced in a comprehensive range of sizes and materials, they offer
versatility, compactness, weight saving and cost effectiveness in connecting piping system.

Standard pressure classes, sizes and flange types

A full range of compact flanges – equivalent to or with higher rating than ASME flanges are readily available.
The Compact Flange covers the usual range of nominal pipe size from ½” to 42”. It is also available,
as standard, in sizes from 26” to 42” for Class 1500, from 14” to 24” for Class 2500 and from ½” to 20”
for Class 4500.
The Compact Flange is available as standard, with the following flange types: weld neck flange, blind flange,
swivel flange, integral (equipment) flange, rigid interface and line blanks. Orifice flanges, restriction orifices
and drip rings are also available on request.
The integral (valve) flange neck outside diameter fulfils the minimum wall thickness requirements given in
ASME B16.34, Table 3 with the inside diameter given in ASME B167.34, Table A1.
Access is made for torque tool with standard sockets in order to allow for valve-to-valve make up.

The envelope for CL600 to CL1500 up to 24” and CL2500 up to 12” is within the ANSI flange envelope. This means that standard flange castings “former” can
be used without any modification. Major valve manufactures covering ball, gate, globe, choke and plug valves, have confirmed that they can use the integral
compact flange on their valves.

Materials

Compact Flanges are available from standard forging with seal ring in compatible high strength material. The table below lists the more common material
combinations:
All seal rings are coated to provide lubrication during make-up. A polymer based coating (PTFE) is used up to 250°C, and molybdenum disulphide (MoS2) coating
is used up to 350°C. Silver plating is available for liquid oxygen service.

FLANGESEAL RINGBOLTING
ASTM A105
ASTM A350 LF2
ASTM A694 F52
ASTM A694 F60
ASTM A694 F65
AISI 4130 (UNS 41400)
AISI 41 40ASTM A193 B7
ASTM A193 B16
ASTM A320 L7
ASTM A320 L43
ASTM 182 F316
ASTM 182 F44 (6Mo)ASTM A182 F51
ASTM 182 F49
ASTM 182 F51 (duplex)
ASTM 182 F53/F55 (Super duplex)
ASTM A564 630 (17-4Ph)
 
ASTM A182 F53/F55
INCONEL 625
INCOLOY 825
OVERLAY ON SEALING AREA, CONTACT SURFACE AND BORE IF REQUIRED.

Applications

The compact flange can be used in many applications throughout a variety of different industries. The many features and benefits of the sealing integrity have
gained acceptance in a variety of service conditions. The following is a partial list existing and/or potential service applications.
General – High-pressure, high temperature, hard to hold gas streams, vibrating or pulsating conditions and corrosive service.
Oil and Gas production – Subsea and onshore pipeline transmission/distribution, flow lines, risers, manifolds, well heads, injection systems, end fittings.